They're literally two cards in one, after all
A good strategy might be to pick one or two strong attacker Pokemon, such as Blastoise VMAX, and then support it with other cards that help it reach its full potential, like Suicune V for quick attacks or support Pokemon that help you draw more cards
Because so few people got one of these cards, they're valuable to collectors
Humility This is one of my favorite Magic cards of all time
Now, the entire team of heroes shares a life total of 60
Since he's only a 2/3, you'll want to make sure you have some cards like Whispersilk Cloak or Demonic Embrace to make sure Varragoth can attack each turn, getting the most value you can from his ability